Board, optical module, OLT, and information processing method

ABSTRACT

Embodiments of this application disclose a board, an optical module, a MAC chip, a DSP, and an information processing method. The board in the embodiments of this application includes a media access control (MAC) chip, a digital signal processor (DSP), and an equalizer. The MAC chip is configured to send first information to the DSP at an optical network unit (ONU) online stage, where the first information includes a first ONU identifier. The DSP is configured to receive the first information, and determine a first reference equalization parameter, where the first reference equalization parameter is related to the first ONU identifier. The DSP is further configured to set an equalization parameter of the equalizer to the first reference equalization parameter.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/CN2018/112890, filed on Oct. 31, 2018, the disclosure of which ishereby incorporated by reference in its entirety.

TECHNICAL FIELD

This application relates to the communications field, and in particular,to a board, an optical module, an optical line terminal (OLT), and aninformation processing method.

BACKGROUND

In a current network structure, a plurality of optical fibers are laidout and new technologies such as dense wavelength division multiplexing(DWDM) are applied to implement deployment of a backbone network. Inaddition, as broadband access technologies develop and a passive opticalnetwork (PON) system proliferates and rapidly expands, a section betweenthe backbone network and a local area network or a home user known asthe “last mile” is implemented.

The PON includes an optical line terminal (OLT), an optical distributionnetwork (ODN), and a plurality of optical network units (ONU). The OLTis configured to connect to the backbone network, and the ONU isconfigured to connect to a regional network or the home user. Forexample, a common ONU is an optical modem. The OLT communicates with theplurality of ONUs through the ODN. The ODN includes a feeder fiber, anoptical splitter, and a distribution fiber that include differentpassive optical devices. The passive optical devices mainly include asingle-mode fiber and an optical cable, an optical fiber ribbon and aribbon optical cable, an optical connector, a passive optical splitter,a passive optical attenuator and an optical fiber connector, and thelike.

When the OLT is connected to the ONU and receives an optical signal sentby the ONU, the OLT cannot immediately obtain effective information fromthe optical signal, and needs to first perform signal equalizationprocessing on the optical signal using an electrical domain equalizationtechnology, for example, an optical digital signal processing (oDSP)technology. Specifically, the OLT needs to first determine a referenceequalization parameter and performs signal equalization processing onthe received optical signal through an equalizer by using the referenceequalization parameter, to obtain a processed optical signal. Then, theOLT can obtain effective information from the processed optical signal.

Because passive devices and distances between the OLT and different ONUsare different, reference equalization parameters required for opticalsignals sent by different ONUs are different. Therefore, in the priorart, each time the OLT receives an optical signal sent by an ONU, theOLT may first preset an initial equalization parameter that is usuallyall 0, and then perform iterative convergence on the preset initialequalization parameter using the optical signal, to obtain acorresponding reference equalization parameter. Finally, the OLTperforms signal equalization processing on the optical signal using thereference equalization parameter, to obtain an optical signal from whichthe OLT can obtain effective information. However, the iterativeconvergence requires a period of time. The OLT can perform, only afterthe period of time, signal equalization processing on the optical signalto obtain the processed optical signal, and obtains effectiveinformation from the processed optical signal. This causes a relativelylong delay.

SUMMARY

Embodiments of this application provide a board, an optical module, anOLT, and an information processing method, to quickly set anequalization parameter of an equalizer for an ONU at an ONU online stageand reduce a delay.

A first aspect of this application provides a board. The board includesa MAC chip, a DSP, and an equalizer.

The MAC chip sends first information to the DSP at an ONU online stage,where the first information includes a first ONU identifier. The DSPreceives the first information, and determines a first referenceequalization parameter, where the first reference equalization parameteris related to the first ONU identifier. The DSP sets an equalizationparameter of the equalizer to the first reference equalizationparameter.

In this application, the MAC chip may send the first information to theDSP, where the first information includes the first ONU identifier. TheDSP may determine the related first reference equalization parameterbased on the first ONU identifier, and set the equalization parameter ofthe equalizer to the first reference equalization parameter.Reconvergence does not need to be performed. This saves time and reducesa delay.

In some embodiments of this application, an OLT may periodically “open awindow” to register an ONU that newly goes online. After the OLT “closesthe window”, an ONU online stage starts. At the ONU online stage, theMAC chip is configured to serve an online ONU. It should be noted thatthe ONU that newly goes online may be used as the online ONU at the ONUonline stage to receive a service from the board (including the MACchip, an optical module, and the like, which is not limited herein).

In some feasible implementations, the first information includes aninformation field, and the information field includes the first ONUidentifier, to determine a manner of carrying the first ONU identifier.In some feasible embodiments, the information field may further includea check field. A check bit, also referred to as a parity bit (paritybit), is a binary number indicating whether a quantity of is in a binarynumber with a given quantity of bits is an odd number or an even number,and is a simplest error detection code. Details are not describedherein. For example, the information field may be information including10 bits (including the check bit) of the first ONU identifier and thecheck bit, and the first ONU identifier may be one of 110110111,101101110, or 110111011.

In some feasible implementations, the DSP is specifically configured to:after receiving the first information, obtain the first ONU identifierfrom the first information, and before an upstream optical signalcorresponding to the first ONU identifier arrives, set the equalizationparameter of the equalizer to the first reference equalizationparameter. The DSP may send a reset signal to a TIA, so that the opticalmodule receives an optical signal through the TIA within a firstupstream transmission time. The DSP can set the first referenceequalization parameter after receiving the first information, and doesnot need to store the first reference equalization parameter, tominimize storage load of the DSP.

In some feasible implementations, the first information includes aninformation field. The information field includes at least one piece oftime sequence information. The at least one piece of time sequenceinformation includes first time sequence information, and the first timesequence information is used to indicate a correspondence between thefirst ONU identifier and a first upstream transmission time. The DSP isspecifically configured to determine the first reference equalizationparameter corresponding to the first ONU identifier, and set theequalization parameter of the equalizer to the first referenceequalization parameter before the first upstream transmission time.Reconvergence does not need to be performed to determine the firstreference equalization parameter. This saves time and reduces a delay.In some feasible embodiments, the first upstream transmission time is atime within which an ONU indicated by the first ONU identifier sends anoptical signal to the OLT. It should be noted that the first upstreamtransmission time may be a time point or a time period. This is notlimited herein. In this manner, after receiving the first information,the DSP obtains the first upstream transmission time corresponding tothe first ONU identifier, and does not immediately set the equalizationparameter of the equalizer, but sets the equalization parameter of theequalizer to the first reference equalization parameter before the firstupstream transmission time, so that the optical signal is received.Because the MAC chip does not need to temporarily send an indication toset a reference equalization parameter, and may indicate, to the DSP inadvance, a time for setting each reference equalization parameter, theMAC chip can arrange a working thread more freely.

In some feasible implementations, the first information further includesa demarcation field, a start field, and an end field, where thedemarcation field is used to be identified by the DSP. In someembodiments of this application, content of the demarcation field may beagreed on in advance. The demarcation field may be information of threebits, for example, 010, 110, 101, 111, or 001, or may be information offour or more bits. This is not limited herein. 010 is used as anexample. The DSP may continuously search for the signal 010, and when010 is found, the DSP determines that 010 is a demarcation field, anddetermines that a frame including the demarcation field carries thefirst information. In this case, the DSP may obtain the first ONUidentifier from the frame. In some feasible embodiments, the demarcationfield may alternatively be a field of four bits or another quantity ofbits. This is not limited herein. When identifying the demarcationfield, the DSP may determine that a frame in which the demarcation fieldis located carries the first information, and may obtain the first ONUidentifier from the frame.

In some feasible embodiments, the start field is used to indicate thatthe information field starts, and the end field is used to indicate thatthe information field ends. In some feasible embodiments, the startfield is information of four bits (or another quantity of bits, which isnot limited herein), for example, 1111 (or 0000, which is not limitedherein). The end field may be information of four bits (or anotherquantity of bits, which is not limited herein), for example, 0000 (or1111, which is not limited herein). In some feasible embodiments, thefirst information may alternatively include a plurality of frames. Theplurality of frames have same functions as the demarcation field, thestart field, the information field, and the end field have. This is notlimited herein.

In some feasible implementations, the board further includes a rateselection RATE_SEL pin. The RATE_SEL pin is connected to the MAC chipand the DSP. The RATE_SEL pin may be used by the MAC chip to send rateinformation to the DSP, and send the first information to the DSP at theONU online stage. Therefore, a pin used by the MAC chip to send thefirst information to the DSP is determined.

In some feasible implementations, the board further includes atransimpedance amplifier TIA. The DSP is connected to the TIA, and theDSP is further configured to send a reset signal to the TIA. In somefeasible implementations, there are at least two TIAs, and the TIAsinclude a 50G passive optical network PON TIA and a 10G PON TIA.Therefore, the MAC chip does not need to send a reset signal to the DSPthrough two reset pins. In this way, the two reset pins are vacated foranother purpose.

In some feasible implementations, the first information further includesa rate field. The rate field is used to indicate whether to send thereset signal to the 50G PON TIA or the 10G PON TIA, so that the DSPdetermines a TIA to which the reset signal is to be sent. It should benoted that the rate field may have only one bit, for example, 0 or 1.For example, 0 may indicate that a rate of the ONU is 10 Gb/s, and 1 mayindicate that the rate of the ONU is 50 Gb/s; or 1 may indicate that arate of the ONU is 10 Gb/s, and 0 may indicate that the rate of the ONUis 50 Gb/s. This is not limited herein. The rate field is used toindicate the rate (for example, 10 Gb/s or 50 Gb/s) of the ONU indicatedby the first ONU identifier, so that the DSP can determine whether toreset the 10G PON TIA or the 50G PON TIA.

In some feasible implementations, the board further includes two resetpins. The DSP may send the reset signal to a corresponding TIA. Thereset signal does not need to be sent through the two reset pins. Therate field is sent to the DSP through the RATE_SEL pin, and the DSP cansend the reset signal to a correct TIA based on the rate field. In thisway, the two reset pins originally used to transmit the reset signal arevacated. The MAC chip sends two differential clock signals to the DSPthrough the two reset pins, so that a pin does not need to be added tothe board, and the board does not need to connect to an external clockchip. This implements time synchronization of each component in the OLT.

In some feasible implementations, the equalizer performs convergence atan ONU registration stage to obtain the first reference equalizationparameter. In some embodiments of this application, the equalizer in theoptical module may perform convergence on a preset initial equalizationparameter by using a registration optical signal, to obtain the firstreference equalization parameter. The first reference equalizationparameter is used to perform signal equalization processing on theregistration optical signal. In some feasible embodiments, the presetinitial equalization parameter may be set to a random array or a fixedarray, for example, an array (0, 0, 0, . . . , 0) that is all 0. This isnot limited herein. The MAC chip is further configured to allocate, atthe ONU registration stage, the first ONU identifier to the ONU thatnewly goes online, and send the first ONU identifier to the DSP. The DSPstores a correspondence between the first ONU identifier and the firstreference equalization parameter.

In some feasible implementations, the DSP is further configured to storea correspondence group. The correspondence group includes at least thecorrespondence between the first ONU identifier and the first referenceequalization parameter. In some embodiments of this application, afterreceiving the first ONU identifier, the DSP may obtain the firstreference equalization parameter from the equalizer, and then store thecorrespondence between the first reference equalization parameter (forexample, (Cp0, Cp1, Cp2, . . . , Cpn)) and the first ONU identifier (forexample, 110110111). In some feasible embodiments, the correspondencemay be stored in a configuration table. In some feasible embodiments,the DSP may further store a plurality of correspondences, referred to asthe correspondence group herein. The correspondence group includes atleast the correspondence between the first ONU identifier and the firstreference equalization parameter. In some feasible embodiments, thecorrespondence group may be stored in the configuration table.

In some implementations, that the DSP determines the first referenceequalization parameter includes: the DSP searches the correspondencegroup for the first reference equalization parameter corresponding tothe first ONU identifier. The first ONU identifier and the firstreference equalization parameter are paired for storage, so that the DSPcan determine the first reference equalization parameter after receivingthe first information sent by the MAC chip. This implements fastconvergence.

In some feasible implementations, after the DSP sets the equalizationparameter of the equalizer to the first reference equalizationparameter, the equalizer is further configured to perform convergence onthe first reference equalization parameter to obtain a second referenceequalization parameter. The DSP is further configured to set theequalization parameter of the equalizer to the second referenceequalization parameter. An appropriate equalization parameter is relatedto a network status, and the network status may not change much in ashort period of time. Therefore, the first reference equalizationparameter is very close to the second reference equalization parameter.In comparison with convergence performed on the preset initialequalization parameter, the appropriate equalization parameter is morequickly obtained through convergence performed on the first referenceequalization parameter. This improves convergence efficiency and savestime.

In some feasible implementations, the board further includes the opticalmodule. The DSP and the equalizer are integrated in the optical module;or the DSP is integrated with the MAC chip; or the equalizer isintegrated in the DSP, and the DSP is integrated in the optical module.The board can be formed in different manners to adapt to differentscenarios.

A second aspect of this application provides an optical module,including a DSP and an equalizer. When a MAC chip sends firstinformation to the DSP at an ONU online stage, the DSP receives thefirst information, determines a first reference equalization parameter,and sets an equalization parameter of the equalizer to the firstreference equalization parameter. The first information includes a firstONU identifier, and the first reference equalization parameter isrelated to the first ONU identifier.

In some feasible implementations, the DSP in the optical moduleaccording to the second aspect of this application is configured toperform a same function as the DSP in the implementations of the boardaccording to the first aspect of this application performs. Theequalizer in the optical module according to the second aspect of thisapplication is configured to perform a same function as the equalizer inthe implementations of the board according to the first aspect of thisapplication performs. Details are not described herein again.

A third aspect of this application provides a MAC chip. The MAC chip isconfigured to send first information to a DSP at an ONU online stage,where the first information includes a first ONU identifier. The DSPreceives the first information, determines a first referenceequalization parameter, and sets an equalization parameter of anequalizer to the first reference equalization parameter. The firstreference equalization parameter is related to the first ONU identifier.

In some feasible implementations, the MAC chip according to the thirdaspect of this application is configured to perform a same function asthe MAC chip in the implementations of the board according to the firstaspect of this application performs. Details are not described hereinagain.

A fourth aspect of this application provides a DSP. The DSP isconfigured to: when a MAC chip sends first information to the DSP at anONU online stage, receive the first information, determine a firstreference equalization parameter, and set an equalization parameter ofan equalizer to the first reference equalization parameter. The firstinformation includes a first ONU identifier, and the first referenceequalization parameter is related to the first ONU identifier.

In some feasible implementations, the DSP according to the fourth aspectof this application is configured to perform a same function as the DSPin the implementations of the board according to the first aspect or theoptical module according to the second aspect of this applicationperforms. Details are not described herein again.

A fifth aspect of this application provides an OLT, including a board.The board includes a MAC chip, a DSP, and an equalizer. The MAC chip isconfigured to send first information to the DSP at an ONU online stage,where the first information includes a first ONU identifier. The DSP isconfigured to receive the first information, and determine a firstreference equalization parameter, where the first reference equalizationparameter is related to the first ONU identifier. The DSP is furtherconfigured to set an equalization parameter of the equalizer to thefirst reference equalization parameter.

In some feasible implementations, the board is configured to perform asame function as the board in the implementations of the board accordingto the first aspect of this application performs. Details are notdescribed herein again.

A sixth aspect of this application provides an information processingmethod, including:

A MAC chip sends first information to a DSP at an ONU online stage,where the first information includes a first ONU identifier. The DSPreceives the first information, and determines a first referenceequalization parameter, where the first reference equalization parameteris related to the first ONU identifier. The DSP sets an equalizationparameter of an equalizer to the first reference equalization parameter.

In some feasible implementations, the method steps implemented by thecomponents according to the foregoing aspects are further performed inthe method. Details are not described herein again.

A seventh aspect of this application provides a computer-readablestorage medium. The computer-readable storage medium stores aninstruction. When the instruction is run on a computer, the computer isenabled to perform the method according to the foregoing aspect.

In this application, the MAC chip may send the first information to theDSP, where the first information includes the first ONU identifier. TheDSP may determine the related first reference equalization parameterbased on the first ONU identifier, and set the equalization parameter ofthe equalizer to the first reference equalization parameter.Reconvergence does not need to be performed. This saves time and reducesa delay.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1-1 is a schematic diagram of a location of a PON in a networkstructure;

FIG. 1-2 is a schematic diagram of an embodiment of an architecture of aPON;

FIG. 1-3 is a front view of an OLT;

FIG. 1-4 is a schematic diagram of an internal architecture of a board;

FIG. 1-5 is a schematic diagram of another embodiment of an architectureof a board;

FIG. 2-1 is a schematic diagram of an embodiment of an informationprocessing method;

FIG. 2-2 is a schematic diagram of composition of a time sequenceinformation frame; and

FIG. 3 is a schematic diagram of another embodiment of an informationprocessing method.

DESCRIPTION OF EMBODIMENTS

The following describes the technical solutions in the embodiments ofthis application with reference to the accompanying drawings in theembodiments of this application. It is clear that the describedembodiments are merely some but not all of the embodiments of thisapplication.

In the specification, claims, and accompanying drawings of thisapplication, the terms “first”, “second”, “third”, “fourth”, and thelike (if existent) are intended to distinguish between similar objectsbut do not necessarily indicate a specific order or sequence. It shouldbe understood that the data termed in such a way are interchangeable inproper circumstances, so that the embodiments described herein can beimplemented in an order other than the order illustrated or describedherein. Moreover, the terms “include”, “contain”, and any other variantsmean to cover the non-exclusive inclusion, for example, a process,method, system, product, or device that includes a list of steps orunits is not necessarily limited to those units, but may include otherunits not expressly listed or inherent to such a process, method,system, product, or device.

In a current network structure, a backbone network is often deployed. Asa PON proliferates and rapidly expands, a section between the backbonenetwork and a local area network or a home user is implemented. FIG. 1-1is a schematic diagram of a location of a PON in a network structure. AnOLT in the figure is connected to a backbone network, and may provideservices for a plurality of ONUs through an ODN. One ONU may serve aplurality of user equipment, such as a mobile phone and a computer. Thisis not limited herein.

FIG. 1-2 is a schematic diagram of an embodiment of an architecture of aPON 100. The PON 100 includes an OLT 101, an ODN 102, and an ONU 103.The OLT 101 is configured to connect to a backbone network, and the ONU103 is configured to connect to a local area network or a home user. TheOLT 101 and the ONU 103 are connected through the ODN 102 to implementcommunication.

In the embodiments of this application, the OLT 101 is a core componentin the PON 100. The OLT 101 is usually placed in a central office andprovides an optical fiber interface of the passive optical network for auser. It should be noted that the OLT 101 is mainly configured toimplement upstream connection to an upper-layer network, completeupstream access of the PON 100, and connect to customer-premisesequipment, namely, the ONU 103, through the ODN 102, to implementfunctions of controlling, managing, and registering equipment oncustomer-premises, namely, the ONU 103.

In some embodiments of this application, the ONU 103 is customer-premiseequipment in the PON 100, and is placed on customer premises andconnected to the OLT 101. The ONU 103 is mainly configured to receivedata sent by the OLT 101, respond to a management command sent by theOLT 101 and perform corresponding adjustment, buffer Ethernet data of auser, and perform sending to an upstream direction and another usermanagement function in a transmit window allocated by the OLT 101, toprovide the user with services such as voice, data, and multimedia.

In some embodiments of this application, the ODN 102 includes a passiveoptical device. The passive optical device is also referred to as an“optical passive device”. The passive optical device is a device thatdoes not perform optical-to-electrical energy conversion in a process ofimplementing functions of the passive optical device during fiber-opticcommunication, and includes components such as an optical fiberconnector (optical fiber connector), an optical directional coupler(optical directional coupler), an optical isolator (optical isolator),or an optical attenuator (optical attenuator). The passive opticaldevice is used for optical fiber connection, optical power allocation,optical signal attenuation, optical wavelength division multiplexing,and the like in a system of the PON 100, and features a high returnloss, a low insertion loss, high reliability, stability, mechanicalabrasion resistance, corrosion resistance, easy operation, and the like.Passive optical devices are widely used in long-range communication, aregional network and fiber to home, video transmission, optical fibersensing, and the like. The passive optical device is an important partof the system of the PON 100, and is also an indispensable device in anoptical fiber application field.

When the OLT 101 is connected to the ONU 103 through the ODN 102, andreceives an optical signal sent by the ONU 103, the OLT 101 cannotimmediately obtain effective information from the optical signal.Instead, the OLT 101 needs to first perform signal equalizationprocessing on the optical signal by using a signal equalizationtechnology, and convert the optical signal into an electrical signal, toobtain effective information from the electrical signal. Previously, theOLT 101 needs to first determine an equalization parameter of anequalizer, performs signal equalization processing on the receivedoptical signal through the equalizer by using the equalizationparameter, to obtain a processed optical signal, and converts theprocessed optical signal into an electrical signal, to obtain effectiveinformation from the electrical signal.

In some feasible embodiments, the OLT 101 may be shown in FIG. 1-3(which is a front view of the OLT). The OLT 101 may include a pluralityof boards. The plurality of boards include a service board, a maincontrol board, a management board, and the like. The OLT 101 may furtherinclude a dust filter, a cable tray, a fan module, and the like. This isnot limited herein. For example, the board is a service board. One boardmay have a board slot area. The board slot area may include a pluralityof slots, and each slot may be provided to an optical module forinsertion.

In the embodiments of this application, an information exchange processof an internal component in the OLT is improved, to implement theforegoing method and effect. The following describes an internalarchitecture of a board. Referring to FIG. 1-4 (which is a schematicdiagram of an internal architecture of a board 104) , the board 104 mayinclude a media access control (MAC) chip 1041 and a digital signalprocessor (DSP) 1042.

It should be noted that the MAC chip 1041 may control access of a nodeto a physical layer by using a MAC protocol. In the embodiments of thisapplication, the DSP 1042 may perform optical-to-electrical conversionon a received optical signal. Specifically, the DSP 1042 may implementoptical-to-electrical conversion through a chip that can implement adigital signal processing technology. To be specific, an electricalsignal is converted into an optical signal at a transmit end, and anoptical signal is converted into an electrical signal at a receive end.This is not limited herein.

In some feasible embodiments, the board may further include an equalizerand an optical module. The DSP and the equalizer are integrated in theoptical module; or the DSP is integrated with the MAC chip; or theequalizer is integrated in the DSP, and the DSP is integrated in theoptical module. This is not limited herein.

In some feasible embodiments, the optical module may be integrated inthe board, or may be used as an external device of the board. This isnot limited herein. When the optical module is used as the externaldevice of the board, the optical module includes the DSP and theequalizer. The optical module is inserted into the board, and exchangesinformation with the MAC chip of the board through a plurality of pinsin an insertion port, to receive power provided by the board, andconvert an electrical signal transmitted by the board into an opticalsignal, or convert a received optical signal into an electrical signaland send the electrical signal to the board, to implementoptical-to-electrical conversion. The plurality of pins include tworeset pins and one RATE_SEL pin.

The following provides description by using an example. As shown in FIG.1-5 (which is a schematic diagram of another embodiment of anarchitecture of a board), an example in which the DSP 1042 is integratedin an optical module 105, the MAC chip 1041 is located in the board 104,and the optical module 105 is an external device of the board 104 and isinserted into the board 104 is used for description.

In the embodiments of this application, the optical module 105 furtherincludes an equalizer 1043. The equalizer 1043 is configured to performsignal equalization processing on a received optical signal. Theequalizer 1043 is a component configured to correct anamplitude/frequency characteristic and a phase/frequency characteristicof a transmission channel. In some feasible embodiments, the equalizer1043 may be a digital equalizer 1043 or an analog equalizer 1043. Thisis not limited herein. It should be noted that the equalizer 1043 may beintegrated in the DSP 1042, or may be an independent module. This is notlimited herein.

In the embodiments of this application, the optical module 105 furtherincludes at least one TIA. When the optical module 105 includes two ormore TIAs, the optical module 105 is an integrated optical module 105.As shown in FIG. 1-5 , the optical module 105 includes two TIAs: a 10GPON TIA 1044-0 and a 50G PON TIA 1044-1. The 10G PON TIA 1044-0corresponds to a 10G PON system with an upstream/downstream rate of 10Gb/s, and the 50G PON TIA 1044-1 corresponds to a 50G PON system with anupstream/downstream rate of 50 Gb/s. In this case, the optical module105 can receive and process an optical signal sent by an ONU with a rateof 10 Gb/s or 50 Gb/s.

In the prior art, the MAC chip 1041 sends a reset signal to acorresponding TIA through one of two reset pins (each of which is usedto send the reset signal to the 10G PON TIA 1044-0 or the 50G PON TIA1044-1), so that the corresponding TIA can receive an optical signal. Inthe embodiments of this application, information exchange between theMAC chip 1041 and the DSP 1042 is improved, and the MAC chip 1041 doesnot need to send a reset signal to the DSP 1042 through the two resetpins. In this way, the two reset pins are vacated for another purpose.

For example, in some feasible embodiments, a clock chip 1045 may bebuilt in the board 104, and sends two differential clock signals to theDSP 1042 through the two vacated reset pins. It should be noted that aclock signal is generated by a clock generator, has a fixed clockfrequency, is usually used in a synchronization circuit to determinewhen to update a status in a logic unit, and is a semaphore that has afixed cycle and is unrelated to running, and therefore plays a timerrole, to ensure that related electronic components can synchronouslyoperate. The clock generator generates a clock through an oscillatorthat can provide square wave output. An oscillator circuit always uses afeedback loop to make the oscillator oscillate, and enables theoscillator to operate at a specific frequency by feeding back acorresponding parameter. In the embodiments of this application, twodifferential clock signals are transmitted through the two reset pins ina differential transmission mode, to ensure that the MAC chip 1041 andthe DSP 1042 synchronously operate. In some feasible embodiments, theclock chip 1045 may alternatively be integrated in the MAC chip 1041.This is not limited herein.

In the prior art, because passive devices and distances betweendifferent ONUs and an OLT are different, equalization parametersrequired for optical signals sent by different ONUs are different.Therefore, in the prior art, each time the OLT receives an opticalsignal sent by an ONU, the OLT first sets a preset initial equalizationparameter that is usually (0, 0, . . . , 0), and then performsconvergence on the preset initial equalization parameter by using theoptical signal sent by the ONU to obtain a corresponding referenceequalization parameter, performs signal equalization processing on thereceived optical signal by using the reference equalization parameter,and converts a processed optical signal into an electrical signal, toobtain an electrical signal from which the OLT can obtain effectiveinformation. However, it usually takes some time to perform convergenceon the preset initial equalization parameter to obtain the referenceequalization parameter. This causes a relatively long delay in a processin which the ONU receives a service from the OLT.

In some embodiments of this application, a MAC chip may send firstinformation to a DSP, where the first information includes a first ONUidentifier. The DSP may determine a related first reference equalizationparameter based on the first ONU identifier, and set an equalizationparameter of an equalizer to the first reference equalization parameter.Reconvergence does not need to be performed. This saves time and reducesa delay.

Therefore, the following describes an example information exchangeprocess of each internal component of the board in the embodiments ofthis application. Specifically, two embodiments may be used fordescription based on different equalization parameter settings.

1. Set an equalization parameter of an equalizer to a first referenceequalization parameter.

Referring to FIG. 2-1 , an embodiment of this application furtherprovides an information processing method, including the followingsteps.

201: An optical module detects a registration optical signal at an ONUregistration stage.

In some embodiments of this application, an OLT periodically opens awindow to enter the ONU registration stage. At the ONU registrationstage, an already online ONU temporarily stops sending an opticalsignal, but an ONU that newly goes online sends an optical signal.Alternatively, the optical module temporarily stops receiving opticalsignals sent by an online ONU, but monitors optical signals sent by anONU that newly goes online. In some embodiments of this application,because an optical signal is used to register the ONU, the opticalsignal is referred to as the registration optical signal. When theoptical module detects the registration optical signal, a DSP sends areset signal to a TIA, so that the TIA receives the registration opticalsignal.

It should be noted that during the operation of an electronic devicesuch as a programmable chip (for example, a single-chip microcomputer),a programmable controller, or a microcomputer, a software program mayrun abnormally or jump to another program. In this case, a signal may bemanually or automatically sent to a specific hardware interface, so thatthe running of software is restored to the running of a specific programsegment. This process is a reset process. In this process, the signalmanually or automatically sent to the specific hardware interface is thereset signal.

202: The equalizer performs convergence at the ONU registration stage toobtain the first reference equalization parameter.

In some embodiments of this application, after the TIA receives theregistration optical signal, the DSP cannot directly convert theregistration optical signal into an electrical signal. Instead, the DSPneeds to first perform signal equalization processing on theregistration optical signal to obtain a processed registration opticalsignal, and then it can convert the processed registration opticalsignal into an electrical signal. It should be noted that, to performsignal equalization processing on the optical signal, a referenceequalization parameter of the equalizer needs to be determined. Thereference equalization parameter is used to perform signal equalizationprocessing on the optical signal.

It should be noted that on a bandwidth-limited channel duringcommunication, inter-symbol interference due to multipath impact maydistort a transmitted signal, so that a bit error occurs duringreception. The inter-symbol interference is a main obstacle tohigh-speed data transmission on a mobile wireless communication channel.Therefore, the equalizer at a receive end can cancel, by generating acharacteristic opposite to that of the channel, the inter-symbolinterference caused by a time-varying multipath propagationcharacteristic of the channel. “Equalization” implemented by theequalizer is an effective means to deal with the inter-symbolinterference. Randomness and a time-varying characteristic of a mobilefading channel require that the equalizer can track the time-varyingcharacteristic of a mobile communication channel in real time, and theequalizer is also referred to as an “adaptive equalizer”.

In some embodiments of this application, the equalizer performsconvergence at the ONU registration stage by using a signal equalizationtechnology, to obtain the first reference equalization parameter. Itshould be noted that the equalization technology is to insert a tunablefilter in a digital communications system to correct and compensate fora system characteristic and reduce impact of the inter-symbolinterference. The equalizer is usually implemented by a filter, and thefilter is used to compensate for a distorted pulse. A demodulationoutput sample obtained by a decision device is a sample that iscorrected by the equalizer or obtained after the inter-symbolinterference is cleared. The equalizer continuously adjusts, based on aspecific algorithm, a gain directly from an actual transmitted digitalsignal, therefore can adapt to a random change of the channel andmaintain an optimal state, to have better distortion compensationperformance.

The equalizer usually has two working modes: a training mode and atracking mode. The training mode is used as an example. First, atransmitter transmits a known fixed-length training sequence, so thatthe equalizer at a receiver can make a correct setting. A typicaltraining sequence is a binary pseudo-random signal or a string ofpre-specified data bits, and user data is transmitted immediately afterthe training sequence is sent. The equalizer at the receiver evaluates achannel characteristic through a recursive algorithm and corrects afilter coefficient to compensate the channel. When the training sequenceis designed, the equalizer needs to be capable of obtaining a correctfiltering coefficient based on the training sequence even under a worstchannel condition. In this way, after the training sequence is received,a filtering coefficient of the equalizer is close to an optimal value.When data is received, an adaptive algorithm of the equalizer can tracka changing channel, and the adaptive equalizer continuously changes afiltering characteristic of the adaptive equalizer.

It should be noted that an entire process from adjusting a parameter toforming convergence by the equalizer is a function of an equalizeralgorithm, a structure, and a communication change rate. The equalizerneeds to be trained periodically and repeatedly to effectively eliminatethe inter-symbol interference. In the digital communications system,user data is divided into segments, and the data segments aretransmitted in corresponding time periods. Each time a new data segmentis received, the equalizer uses a same training sequence to performcorrection. The equalizer is usually implemented in a baseband part oran intermediate frequency part of the receiver, and a complex expressionof a baseband envelope may describe a waveform of a band-pass signal.Therefore, a channel response, a demodulation signal, and an adaptivealgorithm may be usually simulated and implemented in the baseband part.

In some embodiments of this application, the equalizer in the opticalmodule may perform convergence on a preset initial equalizationparameter by using the registration optical signal, to obtain the firstreference equalization parameter. The first reference equalizationparameter is used to perform signal equalization processing on theregistration optical signal. In some feasible embodiments, the presetinitial equalization parameter may be set to a random array or a fixedarray, for example, an array (0, 0, 0, . . . , 0) that is all 0. This isnot limited herein.

In some embodiments of this application, if an initial equalizationarray is (C00, C01, C02, . . . , C0n), a target is to calculate an arraywhose mean squared error is less than a preset value. After oneiteration, an array (C10, C11, C12, . . . , C1n) may be obtained, and amean squared error of the array is calculated. If the mean squared erroris greater than the preset value, the iteration continues. After miterations, an array (Cm0, Cm1, Cm2, . . . , Cmn) is obtained, and amean squared error of the array is calculated. If the mean squared erroris greater than the preset value, the iteration continues. After piterations, an array (Cp0, Cp1, Cp2, . . . , Cpn) is obtained, and amean squared error of the array is calculated. If the mean square erroris less than the preset value, the array (Cp0, Cp1, Cp2, . . . , Cpn) isused as the first reference equalization parameter. In some feasibleembodiments, it is insufficient that a mean squared error of an array isless than the preset value after only one calculation. It is requiredthat a mean squared error of an array is less than the preset valueafter a plurality of consecutive calculations, for example, 500 (whichmay alternatively be 1000 or another value, and is not limited herein)calculations. During 500 iterations, if the mean squared error is lessthan the preset value, it is determined that an array obtained after a500^(th) iteration is used as the first reference equalizationparameter.

203: Send a registration electrical signal to a MAC chip.

In some embodiments of this application, after the equalizer performsconvergence to obtain the first reference equalization parameter, theDSP obtains the first reference equalization parameter from theequalizer, and sets the equalization parameter of the equalizer to thefirst reference equalization parameter, to perform signal equalizationprocessing on the registration optical signal to obtain the processedregistration optical signal. The MAC chip cannot process an opticalsignal but can process only an electrical signal. Therefore, the DSPneeds to convert the received registration optical signal into anelectrical signal. In some embodiments of this application, afterobtaining the processed registration optical signal, the DSP convertsthe processed registration optical signal into the electrical signal,referred to as the registration electrical signal herein, and sends theregistration electrical signal to the MAC chip. The MAC chip may obtaineffective information from the registration electrical signal, forexample, a serial number of the ONU that newly goes online, and the MACchip may complete, based on the serial number, registration for the ONUthat newly goes online.

204: The MAC chip allocates, at the ONU registration stage, a first ONUidentifier to the ONU that newly goes online, and sends the first ONUidentifier to the DSP.

In some embodiments of this application, at the ONU registration stage,after receiving the registration electrical signal sent by the DSP, theMAC chip may allocate an identifier to the ONU that newly goes online,to obtain the first ONU identifier. In some feasible embodiments, thefirst ONU identifier may be an array of eight bits, for example,110110111 or 10011110. This is not limited herein. After determining thefirst ONU identifier, the MAC chip may send the first ONU identifier tothe DSP, and the DSP stores the first ONU identifier. In some feasibleembodiments, a board further includes a rate selection RATE_SEL pin. TheRATE_SEL pin is connected to the MAC chip and the DSP. The RATE_SEL pinmay be used by the MAC chip to send rate information to the DSP, andsend the first ONU identifier to the DSP, and may be further used tosend other information in some feasible embodiments. This is not limitedherein. It should be noted that the MAC chip subsequently exchangesinformation with the ONU that newly goes online, to completeregistration of the ONU that newly goes online. Details are notdescribed herein.

205: The DSP stores a correspondence group, where the correspondencegroup includes at least a correspondence between the first ONUidentifier and the first reference equalization parameter.

In some embodiments of this application, after receiving the first ONUidentifier, the DSP may obtain, from the equalizer, the first referenceequalization parameter obtained in step 202, and then store thecorrespondence between the first reference equalization parameter (forexample, (Cp0, Cp1, Cp2, . . . , Cpn)) and the first ONU identifier (forexample, 110110111). In some feasible embodiments, the correspondencemay be stored in a configuration table.

As shown in Table 1, the correspondence between the first ONU identifierand the first reference equalization parameter is obtained.

TABLE 1 ONU ONU Reference sequence number identifier equalizationparameter 1 110110111 (Cp0, Cp1, Cp2, . . . , Cpn)

In some feasible embodiments, the DSP may further store a plurality ofcorrespondences, referred to as the correspondence group herein. Thecorrespondence group includes at least the correspondence between thefirst ONU identifier and the first reference equalization parameter. Insome feasible embodiments, the correspondence group may be stored in theconfiguration table.

As shown in Table 2, the configuration table stores the correspondencegroup, and the correspondence group includes a plurality ofcorrespondences between ONU identifiers and reference equalizationparameters.

TABLE 2 ONU ONU Reference sequence number identifier equalizationparameter 1 110110111 (Cp0, Cp1, Cp2, . . . , Cpn) 2 101101110 (Dp0,Dp1, Dp2, . . . , Dpn) . . . . . . . . . G 110111011 (Bp0, Bp1, Bp2, . .. , Bpn)

In some feasible embodiments, as the board registers the ONU that newlygoes online, the correspondences in the correspondence group in Table 2may be added, to gradually cover all ONUs served by the OLT. Details arenot described herein.

206: The MAC chip sends first information to the DSP at an ONU onlinestage, where the first information includes the first ONU identifier.

In some embodiments of this application, the OLT may periodically “openthe window” to register the ONU that newly goes online. After the OLT“closes the window”, the ONU online stage starts. At the ONU onlinestage, the MAC chip is configured to serve the online ONU. It should benoted that the ONU that newly goes online described in steps 201 to 206may be used as the online ONU at the ONU online stage to receive aservice from the board (including the MAC chip, the optical module, andthe like, which is not limited herein).

It should be noted that at the ONU registration stage, the MAC chip andthe ONU that newly goes online may agree on an upstream transmissiontime for transmitting an optical signal (referred to as an opticalsignal herein) at the ONU online stage, so that the ONU that newly goesonline may send the optical signal to the OLT at the upstreamtransmission time. It should be noted that the upstream transmissiontime may be a time period in a period (for example, a first second ofeach minute), a fixed time period (for example, a second correspondingto 11:09:30 on Oct. 27, 2018), or a time point (for example, 11:09:30 onOct. 27, 2018). This is not limited herein. In some embodiments of thisapplication, the upstream transmission time for an ONU indicated by thefirst ONU identifier is a first upstream transmission time.

At the ONU online stage, the MAC chip may send the first information tothe DSP, where the first information includes the first ONU identifier,so that when the ONU indicated by the first ONU identifier sends anoptical signal, the DSP sets the equalization parameter of the equalizerto the first reference equalization parameter. In some feasibleembodiments, the MAC chip may send the first information to the DSPthrough the RATE_SEL pin.

In some feasible embodiments, the first information may be carried in asingle frame or a plurality of frames for sending. The single frame isused as an example for description. If the first information is carriedin the single frame, the first information may include an informationfield, and the information field may include the first ONU identifier.In some feasible embodiments, the information field may further includea check field. A check bit, also referred to as a parity bit (paritybit), is a binary number indicating whether a quantity of 1 s in abinary number with a given quantity of bits is an odd number or an evennumber, and is a simplest error detection code. Details are notdescribed herein. For example, the information field may be informationincluding 10 bits (including the check bit) of the first ONU identifierand the check bit, and the first ONU identifier may be 110110111,101101110, or 110111011 shown in Table 2.

In some feasible embodiments, the first information further includes ademarcation field, a start field, and an end field. The demarcationfield is used to be identified by the DSP. When identifying thedemarcation field, the DSP may determine that a frame in which thedemarcation field is located carries the first information, and mayobtain the first ONU identifier from the frame.

In some embodiments of this application, content of the demarcationfield may be agreed on in advance. As shown in FIG. 2-2 (which is aschematic diagram of composition of a time sequence information frame,where t is duration of transmitting one bit), the demarcation field isinformation of three bits, for example, 010, 110, 101, 111, or 001, ormay be information of four or more bits. This is not limited herein. 010is used as an example. The DSP may continuously search for the signal010, and when 010 is found, the DSP determines that 010 is a demarcationfield, and determines that a frame including the demarcation fieldcarries the first information. In this case, the DSP may obtain thefirst ONU identifier from the frame. In some feasible embodiments, thedemarcation field may alternatively be a field of four bits or anotherquantity of bits. This is not limited herein.

In some feasible embodiments, the start field is used to indicate thatthe information field starts, and the end field is used to indicate thatthe information field ends. In some feasible embodiments, the startfield is information of four bits (or another quantity of bits, which isnot limited herein), for example, 1111 (or 0000, which is not limitedherein). The end field may be information of four bits (or anotherquantity of bits, which is not limited herein), for example, 0000 (or1111, which is not limited herein). In some feasible embodiments, thefirst information may alternatively include a plurality of frames. Theplurality of frames have same functions as the demarcation field, thestart field, the information field, and the end field have. This is notlimited herein.

207: The DSP searches the correspondence group for the first referenceequalization parameter corresponding to the first ONU identifier, wherethe first reference equalization parameter is related to the first ONUidentifier.

In some embodiments of this application, after receiving the first ONUidentifier, the DSP may determine the corresponding first referenceequalization parameter in the correspondence group (as shown in Table2). For example, if the first ONU identifier is the ONU identifier101101110 corresponding to the sequence number 2, the DSP may determinethat the corresponding first reference equalization parameter is (Dp0,Dp1, Dp2, . . . , Dpn). If the first ONU identifier is the ONUidentifier 110111011 corresponding to the sequence number G, the DSP maydetermine that the corresponding first reference equalization parameteris (Bp0, Bp1, Bp2, . . . , Bpn).

208: The DSP sets the equalization parameter of the equalizer to thefirst reference equalization parameter.

209: The DSP receives, within the first upstream transmission time, theoptical signal sent by the ONU.

210: The DSP performs signal equalization processing on the opticalsignal by using the first reference equalization parameter, to obtain aprocessed optical signal.

In some embodiments of this application, after receiving the firstinformation, the DSP may determine the first reference equalizationparameter based on the first ONU identifier in the first information,and set the equalization parameter of the equalizer to the firstreference equalization parameter. In some feasible embodiments, thefirst information may indicate the first upstream transmission time intwo different manners.

In a first manner, after receiving the first information, the DSPimmediately determines the first reference equalization parameter basedon the first ONU identifier in the first information. This mannercorresponds to that the MAC chip sends the first information before thefirst upstream transmission time, and the DSP does not store acorrespondence between the first ONU identifier and the first upstreamtransmission time. After receiving the first information, the DSP setsthe equalization parameter of the equalizer to the first referenceequalization parameter, so that the optical module can receive theoptical signal from the ONU at the upstream transmission time, andperform signal equalization processing on the optical signal by usingthe first reference equalization parameter. In this manner, afterreceiving the first information, the DSP obtains the first ONUidentifier from the first information, determines the first referenceequalization parameter based on the first ONU identifier, and may sendthe reset signal to the TIA, so that the optical module receives theoptical signal within the first upstream transmission time through theTIA.

In a second manner, the information field included in the firstinformation includes at least one piece of time sequence information,and the at least one piece of time sequence information includes acorrespondence between an ONU identifier and an upstream transmissiontime. The at least one piece of time sequence information includes firsttime sequence information, and the first time sequence information isused to indicate a correspondence between the first ONU identifier andthe first upstream transmission time. In some feasible embodiments, thefirst upstream transmission time is a time within which the ONUindicated by the first ONU identifier sends the optical signal to theOLT. It should be noted that the first upstream transmission time may bea time point or a time period. This is not limited herein. In thismanner, after receiving the first information, the DSP obtains the firstupstream transmission time corresponding to the first ONU identifier,includes the first upstream transmission time, and does not immediatelyset the equalization parameter of the equalizer, but sets theequalization parameter of the equalizer to the first referenceequalization parameter before the first upstream transmission time, sothat the optical signal is received.

In some feasible embodiments, the first information may alternativelyindicate the upstream transmission time in another manner. This is notlimited herein.

In some feasible embodiments, there are at least two TIAs, and the TIAsinclude a 50G passive optical network PON TIA and a 10G PON TIA. In somefeasible embodiments, the first information further includes a ratefield. The rate field is used to indicate whether to send the resetsignal to the 50G PON TIA or the 10G PON TIA. After receiving the firstinformation, the DSP may determine the rate field, and then determine,based on the rate field, whether to send the reset signal to the 10G PONTIA or the 50G PON TIA before the first upstream transmission time, sothat a correct TIA can receive the optical signal.

It should be noted that the rate field may have only one bit, forexample, 0 or 1. For example, 0 may indicate that a rate of the ONU is10 Gb/s, and 1 may indicate that the rate of the ONU is 50 Gb/s; andvice versa. This is not limited herein. The rate field is used toindicate the rate (for example, 10 Gb/s or 50 Gb/s) of the ONU indicatedby the first ONU identifier, so that the DSP can determine whether toreset the 10G PON TIA or the 50G PON TIA. In some feasible embodiments,if the optical module includes a plurality of TIAs for different rates,a quantity of bits of information about the rate field may be increased.For example, if the optical module includes six TIAs for differentrates, the rate field may have three bits. This is not limited herein.In some feasible embodiments, in the frame that carries the firstinformation, the rate field may be between the demarcation field and thestart field, or may be between the start field and the informationfield, or may be between the information field and the end field. Thisis not limited herein.

It should be noted that in the prior art, the MAC chip may send a resetsignal to the DSP of the integrated optical module through two reset(RESET) pins. One of the two reset pins is used to send the reset signalto the 10G PON TIA, and the other reset pin is used to send the resetsignal to the 50G PON TIA. In some embodiments of this application, theDSP may send the reset signal to a corresponding TIA. The reset signaldoes not need to be sent through the two reset pins. The rate field issent to the DSP through the RATE_SEL pin, and the DSP can send the resetsignal to the correct TIA based on the rate field. In this way, the tworeset pins originally used to transmit the reset signal are vacated.Therefore, in some embodiments of this application, the DSP may receive,through the two reset pins, two differential clock signals sent by theboard, so that a pin does not need to be added to the board, and theboard does not need to connect to an external clock chip. Thisimplements time synchronization of each component in the OLT.

In some feasible embodiments, after obtaining the first referenceequalization parameter, the DSP performs signal equalization processingon the optical signal by using the first reference equalizationparameter, to obtain the processed optical signal, converts theprocessed optical signal into a running electrical signal, and sends therunning electrical signal to the MAC chip.

In this application, the MAC chip may send the first information to theDSP, where the first information includes the first ONU identifier. TheDSP may determine the related first reference equalization parameterbased on the first ONU identifier, and set the equalization parameter ofthe equalizer to the first reference equalization parameter.Reconvergence does not need to be performed. This saves time and reducesa delay.

FIG. 3 shows an information processing method, including the followingsteps.

2. Set an equalization parameter of an equalizer to a secondequalization parameter.

301: An optical module detects a registration optical signal at an ONUregistration stage.

302: The equalizer performs convergence at the ONU registration stage toobtain a first reference equalization parameter.

303: Send a registration electrical signal to a MAC chip.

304: The MAC chip allocates, at the ONU registration stage, a first ONUidentifier to an ONU that newly goes online, and sends the first ONUidentifier to a DSP.

305: The DSP stores a correspondence group, where the correspondencegroup includes at least a correspondence between the first ONUidentifier and the first reference equalization parameter.

306: The MAC chip sends first information to the DSP at an ONU onlinestage, where the first information includes the first ONU identifier.

307: The DSP searches the correspondence group for the first referenceequalization parameter corresponding to the first ONU identifier, wherethe first reference equalization parameter is related to the first ONUidentifier.

Steps 301 to 307 are the same as steps 201 to 207, and details are notdescribed herein again.

308: The equalizer further performs convergence on the first referenceequalization parameter to obtain the second reference equalizationparameter.

309: The DSP sets the equalization parameter of the equalizer to thesecond reference equalization parameter.

310: The DSP receives, within the first upstream transmission time, anoptical signal sent by the ONU.

311: The DSP performs signal equalization processing on the opticalsignal by using the first reference equalization parameter, to obtain aprocessed optical signal.

In some embodiments of this application, when the equalization parameterof the equalizer is set in the manner in step 309, because the firstreference equalization parameter is obtained by the equalizer byperforming convergence at the ONU registration stage, the firstreference equalization parameter adapts to a network status at the ONUregistration stage. Therefore, an appropriate equalization parameter maybe recalculated. In some embodiments of this application, after the DSPobtains the first reference equalization parameter, the equalizer mayfurther perform convergence on the first reference equalizationparameter to obtain the second reference equalization parameter. The DSPis further configured to set the equalization parameter of the equalizerto the second reference equalization parameter.

The appropriate equalization parameter is related to a network status,and the network status may not change much in a short period of time.Therefore, the first reference equalization parameter is very close tothe second reference equalization parameter. In comparison withconvergence performed on a preset initial equalization parameter, theappropriate equalization parameter is more quickly obtained throughconvergence performed on the first reference equalization parameter.This improves convergence efficiency and saves time.

It should be noted that if the equalizer performs iterative convergenceon the first reference equalization parameter by using the opticalsignal, after a first reference equalization parameter obtained afterthe iterative convergence is obtained, the original first referenceequalization parameter in the correspondence group in a configurationtable may be replaced by the first reference equalization parameterobtained after the iterative convergence, and the first referenceequalization parameter obtained after the iterative convergence ispaired with the corresponding first ONU identifier for storage, toupdate the correspondence group in the configuration table in real timeto adapt to a time-varying characteristic of a channel.

In this application, the MAC chip may send the first information to theDSP, where the first information includes the first ONU identifier. TheDSP may determine the related first reference equalization parameterbased on the first ONU identifier, and set the equalization parameter ofthe equalizer to the first reference equalization parameter.Reconvergence does not need to be performed. This saves time and reducesa delay.

All or some of the foregoing embodiments may be implemented by usingsoftware, hardware, firmware, or any combination thereof. When softwareis used to implement the embodiments, all or some of the embodiments maybe implemented in a form of a computer program product.

The computer program product includes one or more computer instructions.When the computer program instructions are loaded and executed on acomputer, all or some of the procedures or functions according to theembodiments of the present invention are generated. The computer may bea general-purpose computer, a dedicated computer, a computer network, oranother programmable apparatus. The computer instructions may be storedin a computer-readable storage medium, or may be transmitted from acomputer-readable storage medium to another computer-readable storagemedium. For example, the computer instructions may be transmitted from awebsite, computer, server, or data center to another website, computer,server, or data center in a wired (for example, a coaxial cable, anoptical fiber, or a digital subscriber line (DSL)) or wireless (forexample, infrared, radio, or microwave) manner. The computer-readablestorage medium may be any usable medium accessible by a computer, or adata storage device, such as a server or a data center, integrating oneor more usable media. The usable medium may be a magnetic medium (forexample, a floppy disk, a hard disk, or a magnetic tape), an opticalmedium (for example, a DVD), a semiconductor medium (for example, asolid-state drive Solid State Disk (SSD)), or the like.

What is claimed is:
 1. A board, wherein the board comprises: a media access control (MAC) chip, a digital signal processor (DSP), and an equalizer; wherein the MAC chip is configured to send first information to the DSP at an optical network unit (ONU) online stage, wherein the first information comprises a first ONU identifier; the DSP is configured to receive the first information, and determine a first reference equalization parameter, wherein the first reference equalization parameter is related to the first ONU identifier; and the DSP is further configured to set an equalization parameter of the equalizer to the first reference equalization parameter.
 2. The board according to claim 1, wherein the first information comprises an information field, and the information field comprises the first ONU identifier.
 3. The board according to claim 2, wherein the DSP is configured to set the equalization parameter of the equalizer to the first reference equalization parameter after receiving the first information and before an upstream optical signal corresponding to the first ONU identifier arrives.
 4. The board according to claim 2, wherein the first information further comprises a demarcation field, a start field, and an end field.
 5. The board according to claim 1, wherein the first information comprises an information field, the information field comprises at least one piece of time sequence information, the at least one piece of time sequence information comprises first time sequence information, and the first time sequence information is used to indicate a correspondence between the first ONU identifier and a first upstream transmission time.
 6. The board according to claim 5, wherein the DSP is configured to determine the first reference equalization parameter corresponding to the first ONU identifier, and set the equalization parameter of the equalizer to the first reference equalization parameter before the first upstream transmission time.
 7. The board according to claim 1, further comprising a rate selection (RATE_SEL) pin, wherein that the MAC chip sends the first information to the DSP at the ONU online stage comprises: sending, by the MAC chip, the first information to the DSP through the RATE_SEL pin at the ONU online stage.
 8. The board according to claim 1, wherein the board further comprises a transimpedance amplifier (TIA), the DSP is connected to the TIA, and the DSP is further configured to send a reset signal to the TIA.
 9. The board according to claim 8, wherein there are at least two TIAs, and the TIAs comprise a 50G passive optical network PON TIA and a 10G PON TIA.
 10. The board according to claim 9, wherein the first information further comprises a rate field, and the rate field is used to indicate whether to send the reset signal to the 50G PON TIA or the 10G PON TIA.
 11. The board according to claim 10, further comprising: two reset pins, wherein the MAC chip sends two differential clock signals to the DSP through the two reset pins.
 12. The board according to claim 1, wherein the DSP is further configured to store a correspondence group, wherein the correspondence group comprises at least a correspondence between the first ONU identifier and the first reference equalization parameter; and that the DSP determines the first reference equalization parameter comprises: searching, by the DSP, the correspondence group for the first reference equalization parameter corresponding to the first ONU identifier.
 13. The board according to claim 12, wherein the equalizer is further configured to perform convergence at an ONU registration stage to obtain the first reference equalization parameter; the MAC chip is further configured to allocate, at the ONU registration stage, the first ONU identifier to an ONU that is online, and send the first ONU identifier to the DSP; and the DSP stores the correspondence between the first ONU identifier and the first reference equalization parameter.
 14. The board according to claim 1, wherein the equalizer is further configured to: after the DSP sets the equalization parameter of the equalizer to the first reference equalization parameter, perform convergence on the first reference equalization parameter to obtain a second reference equalization parameter; and the DSP is further configured to set the equalization parameter of the equalizer to the second reference equalization parameter.
 15. The board according to claim 1, wherein the board further comprises an optical module, and the DSP and the equalizer are integrated in the optical module; or the DSP is integrated with the MAC chip; or the equalizer is integrated in the DSP, and the DSP is integrated in the optical module.
 16. An optical line terminal (OLT), wherein the OLT comprises the board according to claim
 1. 17. An information processing method, comprising: sending, by a MAC chip, first information to a DSP at an ONU online stage, wherein the first information comprises a first ONU identifier; receiving, by the DSP, the first information, and determining a first reference equalization parameter, wherein the first reference equalization parameter is related to the first ONU identifier; and setting an equalization parameter of an equalizer to the first reference equalization parameter.
 18. The method according to claim 17, wherein the first information comprises an information field, and the information field comprises the first ONU identifier.
 19. The method according to claim 18, wherein the DSP is configured to set the equalization parameter of the equalizer to the first reference equalization parameter after receiving the first information and before an upstream optical signal corresponding to the first ONU identifier arrives.
 20. The method according to claim 17, wherein the method further comprises: storing, by the DSP, a correspondence group, wherein the correspondence group comprises at least a correspondence between the first ONU identifier and the first reference equalization parameter; and the determining, by the DSP, a first reference equalization parameter comprises: searching, by the DSP, the correspondence group for the first reference equalization parameter corresponding to the first ONU identifier. 